gib Posted July 26, 2003 Share Posted July 26, 2003 Perhaps a dumb idea, but following from a thread about shooting bw in current digicams, would there be any technical advantage in developing a BW only digicam. Could it provide greater resolution at less cost? Link to comment Share on other sites More sharing options...
steven_clark Posted July 26, 2003 Share Posted July 26, 2003 Same resolution, but a nice tripling in sensitivity with no noise increase due to the missing bayer mask. On the other hand it stil wouldn't have the range of B&W film from what I understand. Link to comment Share on other sites More sharing options...
bobatkins Posted July 27, 2003 Share Posted July 27, 2003 There was one I think. A B&W DSLR made by Kodak with a Nikon lens mount if I remember right. DCS 760M, 6 megapixels. Needless to say it didn't catch on and Kodak took their corporate axe to it some time ago. Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted July 27, 2003 Share Posted July 27, 2003 B&W bitmap and greyscale cameras and scanners are standard in industrial applications; such as the scanning of Engineering drawings; scanning/photographing of checks and documents. Many times the color info is not required; and the resulting file size is only one third in size; for a given pixel level; comparing grayscale to RGB. Some industrial scanners also maybe at lower than 8 bits; say 4 to 6 bits of info for greyscale; in older scanners/sensors. (this helps still read a document; with writing too light; which will be lost with a straight bitmap image; where every pixel is either white or black. Greyscale B&W sensors vary in their color accuracy; some types are blind to blue on white; some to yellows on white also. Link to comment Share on other sites More sharing options...
chip l. Posted July 27, 2003 Share Posted July 27, 2003 Just as in Mike Johnson's column: http://www.luminous-landscape.com/columns/sm-03-07-27.shtml I would love to see Epson or Canon come out with a set of BW inks, and maybe a special printer for BW. Just don't feel comfortable with 3rd party inks. And Cone System is too expensive for my wallet. Link to comment Share on other sites More sharing options...
gib Posted July 27, 2003 Author Share Posted July 27, 2003 interesting point Chip. the market evolves...when I started out, BW film was cheaper to lab process and print then colour film (at least I remember it that way) and if I remember correctly the cost per shot was cheaper if you shot Kodachrome (but then you had to pay more for an enlargement print). Now BW lab process and print costs a small fortune. C41 processing machines and volume work I realize are part of that change. Still people seem to respond and enjoy BW images. And 100 ASA colour print film is more expensive than 200 or 400 at smaller retail outlets or is not even available (Walmart where they start out at 200 Fuji, at least here in Canada). So it will be interesting to see how this digital market evolves. The cell phone cameras seem nuts to me but what do I know. Link to comment Share on other sites More sharing options...
bobatkins Posted July 27, 2003 Share Posted July 27, 2003 HEY!!! Wait a minute... <P> Why plug luminous landscape for Mike's column? Mike writes for us too. His column is announced on the home page each week and this week's can be found at <a href="/mjohnston/column21/">HERE</a> Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted July 27, 2003 Share Posted July 27, 2003 Chip; a very interesting point about a B&W only inkjet printer! Link to comment Share on other sites More sharing options...
matthew_kerr Posted July 27, 2003 Share Posted July 27, 2003 And if you took away all the filters on the CCD that colour needs, could you put this B&W sensor in a rangefinder camera with traditional lenses? That would be cool! Link to comment Share on other sites More sharing options...
peter nelson Posted July 27, 2003 Share Posted July 27, 2003 <I>Same resolution, but a nice tripling in sensitivity with no noise increase due to the missing bayer mask.</I><P> No, it would also be higher resolution. Imagine you were shooting a test pattern that was simply blue. Some of the detail would fall on the R and G filters of the bayer bask and not be detected. Bayer-pattern sensors are simply making their <B>BEST GUESS</B> of what the image consisted of. There is no separate LUMINANCE channel to go with the CHROMA channel.<P> A BW-only camera would be WONDERFUL but there's no market for it. Link to comment Share on other sites More sharing options...
bobatkins Posted July 27, 2003 Share Posted July 27, 2003 Well, there must be some used DCS 760Ms around somewhere. Kodak must have sold a least a few! Link to comment Share on other sites More sharing options...
shawn_mertz Posted July 30, 2003 Share Posted July 30, 2003 Fuji has a black & white setting built into it's s1 and s2. it produces basically a desaturated rgb file but it prints better on a frontier printer I think there is a touch of magenta in it although I can't see it in the histograms. It is a very usefull feature when previewing images. would a b&w preview for a color pic be as good as a color preview. Sometimes though with skill, patience and experience a translation from a color file is better. Some of the tricks filters do can help in color balnce and levels before going b&w. Link to comment Share on other sites More sharing options...
david_littleboy__tokyo__ja Posted July 31, 2003 Share Posted July 31, 2003 "No, it would also be higher resolution." No, it would be the same resolution. Bayer cameras resolve about 70% of their Nyquist frequency, and that would be about the limit for a B&W sensor as well. Why? Because to correctly sample the image, you must use an antialiasing filter (since aliasing artifacts are indistinguishable from real data after the fact). And that means that the best you can do is about 70% of Nyquist. Sigh. A B&W camera would have the extra sensitivity. It would also have the advantage that it wouldn't lose 3/4 of its resolution when you put a red filter in front of the lens, so it would be much better for B&W landscapes. Link to comment Share on other sites More sharing options...
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